Dr. Sheppard has no idea his finicky, foreign neighbor is actually retired detective Hercule Poirot. When wealthy Roger Ackroyd is found brutally murdered, Poirot can’t resist stepping it to sort out clues and find the killer. This third Poirot mystery has all the author’s trademark touches — a pithy portrait of English village life, a cast of unforgettable characters, and a plot of Byzantine complexity. Due to its shocking twist ending, the book remains one of the most controversial mysteries ever written.